N Orsk Ornitologisk Forening
Total Page:16
File Type:pdf, Size:1020Kb
Report 3-2016 Survey of Lesser White-fronted Geese in Nakhchivan, Azerbaijan, in January 2015 Vladimir V. Morozov, Elchin Sultanov & Arzu Mammadov Norsk ornitologisk forening ornitologisk Norsk Survey of Lesser White-fronted Geese in Nakhchivan, Azerbaijan, in January 2015 Vladimir V. Morozov, Elchin Sultanov & Arzu Mammadov Norsk Ornitologisk Forening 2016 NOF-BirdLife Norway – Report 3-2016 © Norsk Ornitologisk Forening / BirdLife Norway E-mail: [email protected] Publikation type: Digital document (pdf) Front cover photo: Winter pastures and agriculture fields close to the Aras water reservoir, Nakhchivan. © Vladimir V. Morozov Recommended sitation: Morozov, V.V, Sultanov, E. & Mammadov, A. 2016. Survey of Lesser White- fronted Geese in Nakhchivan, Azerbaijan, in January 2015. NOF-BirdLife Norway - Report 3-2016. 12pp. All photos: © Vladimir V. Morozov. ISSN: 0805-4932 ISBN: 978-82-78-52135-9 BirdLife Norway – Report 3-2016 SUMMARY We carried out a field survey of wintering Lesser White-fronted Geese in the Aras water reservoir in the Nakhchivan Autonomic Republic in the period 20th-24th January 2015. We also surveyed the adjoining flood-plain area of the Aras River valley within Sadarak district near the border of Iran and Turkey in the same period. Only four small flocks of Lesser White-fronted Geese were located, of which the largest being 80 individuals. These observations together with tracking and location data from satellite transmitter tagged birds proves that the whole area of the Aras River valley from the border of Turkey to the Aras reservoir dam, serves as a wintering ground for the species. Considering their high importance, the wetlands of the Aras reservoir and the Sadarak district should be designated as a strictly protected area. The survey also covered numbers and distribution of other waterbird species in the area. Within the Azerbaijan part, more than 25000 individuals of waterfowl and shorebirds overwinter, which qualifies this important area to the list of important RAMSAR wetlands. 1 | P a g e BirdLife Norway – Report 3-2016 CONTENT SUMMARY ....................................................................................................................................................... 1 BACKGROUND .................................................................................................................................................. 3 Aim and objectives .............................................................................................................................................. 3 METHODS & MATERIAL .................................................................................................................................... 3 Itinerary ............................................................................................................................................................... 3 Study area ............................................................................................................................................................ 3 Survey method ..................................................................................................................................................... 3 RESULTS ........................................................................................................................................................... 5 DISCUSSION ..................................................................................................................................................... 9 ACKNOWLEDGEMENTS .................................................................................................................................. 12 REFERENCES ................................................................................................................................................... 12 2 | P a g e BirdLife Norway – Report 3-2016 BACKGROUND The Lesser White-fronted Goose Anser erythropus is listed in the Red Data book of the International Union for the Conservation of Nature (IUCN), as well as in Red Data books of all countries within its distribution area. International research on Lesser White-fronted Goose (later abbreviated as LWfG) found that some birds tagged with satellite transmitters in their breeding area in the Putorana plateau stopped in the Aras River valley during their autumn migration (Romanov & Pospelov 2006). Two birds tagged in Bolshezemelskaya Tundra and the Polar Urals stayed there for the whole winter 2013/2014 (Morozov et al. 2015). These data proved the necessity to carry out further investigations in the Aras River valley to clarify its importance as a wintering ground for LWfG. Aim and objectives To pursue this aim, Birds Russia in collaboration with Azerbaijan Ornithological Society and Institute of Bioresources of Nakhchivan section of Azerbaijan National Academy of Science carried out a pilot study of the Aras reservoir and the Aras River valley in Nakhchivan Autonomic Republic. The main objective was to gather information on the wintering of LWfG as well as the numbers and distribution of other waterbird species in that area. METHODS & MATERIAL Itinerary We carried out a survey for wintering LWfG in the Aras reservoir in the Nakhchivan Autonomic Republic and the adjoining floodplain area of the Aras River valley within Sadarak district near the border of Azerbaijan and Turkey (Figure 1) in the period 20th-24th January 2015. Study area The Aras reservoir was created in 1972, and is located on the boundary between the Islamic Republic of Iran and Nakhchivan Autonomous Republic of Azerbaijan (Figure 1). The coast of the reservoir is situated 10 km to the south and south-west from Nakhchivan city, the capital of Nakhchivan Autonomous Republic of Azerbaijan. The Aras reservoir is located at an altitude of 777m asl. The total area of the reservoir is 14,500 hectares, with a length and width of 52 km and 6.1 km respectively. The maximum depth is 18.2 meters. The reservoir was created for electric energy production and for agricultural irrigation in both countries. The lowland areas at 100-500 meters from the coastline of the reservoir are occupied by winter pastures and agriculture fields (see photo on the front cover of the report). The Azerbaijan part of the Aras reservoir has status as a Governemental Nature Refuge. The climate of the Aras River valley is warm and temperate. The summers are dry and hot. The middle temperatures in spring are +10 - +22°C, in summer +18 - +22°C and in winter-5 - -11°C. Minimal air temperature in winter can be as low as -30 - -32°C. In such cold winters only a small area of the reservoir (about 3-5 hectares) remains free of ice. The natural vegetation in the study area is semi-desert. Survey method The Aras reservoir was surveyed by driving along the coast and counting birds at chosen sites within the water body and the coastline. GPS was used to locate the borders of the counting sectors. 3 | P a g e BirdLife Norway – Report 3-2016 We carried out the bird counts in the first half of the day from sunrise to noon. Later in the afternoon, the counting ceased due to air refraction and unfavorable light conditions. 10х magnification binoculars and 20-60х magnification telescopes were used. Every bird congregation was counted once or twice by three people. The total for each congregation was calculated as an average of these counts. In two cases bird gatherings on water were counted by two people, while the birds located in the adjoining fields and pastures were counted by the third person. The results of counts were summed for each sector and for the whole area. If the light conditions or density of goose flocks did not allow reliable identification of presence of LWfG or species composition with binoculars, a digital camera with 50x zoom and a digital SLR camera with 400mm lens were used. Figure 1. Location and map of Nakhchivan Autonomic Republic. Surveyed areas where LWfG were found are shown in pink. 4 | P a g e BirdLife Norway – Report 3-2016 RESULTS Data from satellite transmitter tracking in previous years showed that LWfG were confined mainly to two areas within the Aras River valley (Figures 1 & 4). The first area is located within Sadarak district and consisted of vast damp low-grass meadows, nourished with water from the canal in the widest part of the Aras River valley (Figures 2 & 4). Within these meadows on the bank of the canal, a flock of grazing geese was spotted on 20th January. It consisted of 202 Greater White-fronted Goose Anser albifrons (later referred to as GWfG) and 11 LWfG of which the latter represented 5.1% of the total numbers. The weather conditions were good and allowed not only counts and proper identification of all geese, but we could also confirm that there were were no transmitter-tagged birds among them. Further analysis of the information obtained through satellite transmitters confirmed the fact that tagged birds stayed in Aras reservoir at the same time. During the second investigation of the area on 24th January, we discovered that the geese stayed within the same habitat and grazed at the same place as on 20th January. The total flock size was 233 geese, of which 11 were LWfG probably the same birds as on 20th January) and 222 GWfG. LWfG accounted for 4.7% of the geese present. Interestingly, at the beginning of the day, there were 120 geese, 3 of which were identified as LWfG, but 30 minutes later another flock of 110-115 geese arrived from a distant part of the meadow and joined the flock. After that,